Sorry, I did and that has not worked. What else is there to try. What would you put in it for an estimate to look for a problem like this?Sorry, I did and that has not worked. What else is there to try. What would you put in it for an estimate to look for a problem like this?

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sea foam
is a type of foam created by the agitation of seawater,particularly when it contains higher concentrations of dissolved organic matter that will just clogg an block the engine. your head gasket is gone you will need to replace the head gasket an probably flush the engine too... Hope this helps

If the brake pedal goes hard right BEFORE the car dies, and not after, then you could have a problem INSIDE the brake power booster. try to verify this next time it dies at a stop, if you can safely pull the dead car off the road into a driveway (or try to make it stall in a bumpy parking lot) - then before you try to restart the car, open the hood, pull off the rubber hose where it's plugged into the brake power booster --> you SHOULD hear a big "Swoosh" of air being sucked into the booster because there's supposed to be a strong vacuum there even after the car stops running. if you get nothing there, your car is dying of an excessive vacuum leak through the brake booster.= bad booster.

What is Sea Foam,and why would you add it?
Nothing I see but the spark plugs,addresses your issues.
Have you looked at the TPS Sensor,with a scanner?
Have you looked at the Ignition with a Scope
Checked MAF Sensor data and cleaned it?
Is the Egr Valve working correctly?
Have you checked fuel pressure?
Are the O2 Sensors,15 years old?
Is the Converter,15 years old and blocked?

this may be the cause, try it and see if it helps, it is a very common cause of problems like yours.Here is the most common cause of surges and stalls and low idle rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.